diff --git a/src/Mod/Fem/femsolver/run.py b/src/Mod/Fem/femsolver/run.py
index 939dd5b48240..28469b62f38a 100644
--- a/src/Mod/Fem/femsolver/run.py
+++ b/src/Mod/Fem/femsolver/run.py
@@ -239,7 +239,7 @@ def _getBesideBase(solver):
                 "Can't start Solver",
                 error_message
             )
-        raise MustSaveError()
+        raise femutils.MustSaveError()
     return path
 
 
@@ -264,7 +264,7 @@ def _getCustomBase(solver):
                 "Can't start Solver",
                 error_message
             )
-        raise DirectoryDoesNotExistError("Invalid path")
+        raise femutils.DirectoryDoesNotExistError("Invalid path")
     return path
 
 
diff --git a/src/Mod/Fem/femtools/femutils.py b/src/Mod/Fem/femtools/femutils.py
index 95dc7ee7967c..2a7a55c37f30 100644
--- a/src/Mod/Fem/femtools/femutils.py
+++ b/src/Mod/Fem/femtools/femutils.py
@@ -355,6 +355,7 @@ def check_working_dir(wdir):
         return False
 
 
+# TODO: move in own error module
 class MustSaveError(Exception):
     pass